B-heptomino

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B-heptomino
B-heptomino image
Pattern type Methuselah
Lifespan 148 generations
Number of cells 7
Bounding box 4×3
Discovered by John Conway
Year of discovery 1970

The B-heptomino is a very common methuselah that evolves into three blocks, two gliders and a ship after 148 generations. Compare with Herschel, which appears at generation 20 of B-heptomino's evolution. It often arises with the cell at top left shifted one space to the left, which does not affect the subsequent evolution. B-heptominoes acquired particular importance in 1996 due to David Buckingham's work on B tracks.

It is considered a failed spaceship, but can be used to make a puffer 2.

In other rules

The B-heptomino is a stable puffer in many rules.

  • In B3/S23-e4e, it evolves into a (16,5)c/74 knightship.
  • In B3/S23-a, it is a glide-symmetric 10c/20 spaceship.
  • In B34ej5y6n/S23, it is an oblique quadratic replicator, one of only a few known.
  • In B36n/S2-i36c7c, it evolves into a glide-symmetric 9c/70 diagonal spaceship.

Image gallery

See also

External links

  • B-heptomino at Eric Weisstein's Treasure Trove of Life